Metal Form is an eminent producer, dealer and exporter of Radiator Accessories, Radiator Caps, Radiator Pressure Caps, Plastic Radiator Pressure Caps, Radiator Filler Necks, Oil / Fuel Filler Caps and many more. Metal Form offers Plastic Radiator Pressure Cap have a plastic construction, also known as Surge Tank Cap or Coolant Cap. These caps follow the same main valve pressure opening and vacuum valve pressure opening. The design for these types of caps is vehicle specific.